Big Block Cylinder Head Intake Port Centerline Length Measurement Needed

[71GSSDemon]

Hey guys, does anyone know off hand (or can measure) the intake port centerline length of a 906 or 452 cylinder head? I can find the measurement for chevys and fords, but nothing on a Mopar head. My assumption for raised runner aftermarket heads it will change, but standard port location should be close, correct? Just working through the optimum total runner length is right for my engine combo and the 2nd or 3rd wave harmonics.

Thanks in advance.

 

[Moparpuller]

Hey guys, does anyone know off hand (or can measure) the intake port centerline length of a 906 or 452 cylinder head? I can find the measurement for chevys and fords, but nothing on a Mopar head. My assumption for raised runner aftermarket heads it will change, but standard port location should be close, correct? Just working through the optimum total runner length is right for my engine combo and the 2nd or 3rd wave harmonics.

Thanks in advance.

I have bare heads at home. I can measure tonight

 

[ValiantS]

Hey guys, does anyone know off hand (or can measure) the intake port centerline length of a 906 or 452 cylinder head? I can find the measurement for chevys and fords, but nothing on a Mopar head. My assumption for raised runner aftermarket heads it will change, but standard port location should be close, correct? Just working through the optimum total runner length is right for my engine combo and the 2nd or 3rd wave harmonics.

Thanks in advance.

The average length is going to be LESS than 5". I'd bet it'll be about 4.75"...close enough for what you're doing IMO.

 

[71GSSDemon]

The average length is going to be LESS than 5". I'd bet it'll be about 4.75"...close enough for what you're doing IMO.

Thank you. I have a few intakes to pick from and been going down the rabbit hole of how top builders are formulating the lengths to maximize what is available. May as well be informed and see what can be accomplished.

I see a rough starting point is 13" total runner length from plenum to valve for an engine running 6000rpm. -1.7" for every 1000rpm increase or +1.7" for every 1000rpm reduction. Just things to keep my mind busy during work.

 

[Moparpuller]

Thank you. I have a few intakes to pick from and been going down the rabbit hole of how top builders are formulating the lengths to maximize what is available. May as well be informed and see what can be accomplished.

I see a rough starting point is 13" total runner length from plenum to valve for an engine running 6000rpm. -1.7" for every 1000rpm increase or +1.7" for every 1000rpm reduction. Just things to keep my mind busy during work.

I got just under 5 inches for a measurement

 

[71GSSDemon]

So, I will want to target 6.25-6.5" of runner in the intake. Thanks guys

 

[MOPARMAGA]

So, I will want to target 6.25-6.5" of runner in the intake. Thanks guys

I'll measure my trickflow track heat intake for you tomorrow, it's probably close.

 

[MOPARMAGA]

So, I will want to target 6.25-6.5" of runner in the intake. Thanks guys

7000-7300 rpm target?

 

[71GSSDemon]

7000-7300 rpm target?

Yes that is the theroetic goal. Performance of the car, i.e. Tire size, gearing, handling, etc will be the learning curve and key parts. Until licensed for 175mph at the 2.25 mile marker, that's as far as you get. After that, then you get 5 miles and speed is dictated by safety equipment you have, hp, and aero.

 

[MOPARMAGA]

Yes that is the theroetic goal. Performance of the car, i.e. Tire size, gearing, handling, etc will be the learning curve and key parts. Until licensed for 175mph at the 2.25 mile marker, that's as far as you get. After that, then you get 5 miles and speed is dictated by safety equipment you have, hp, and aero.

That trickflow track heat intake is about the runner length you wast also, sorry I forgot to get back to you yesterday.